JP3103329U - Swivel fittings - Google Patents

Abstract

[Object] To provide a swivel fitting which can be easily manufactured with a simple structure and is suitable for connection of a hose.
[Constitution] A tubular body 1 having one end serving as a joint portion 15 and a tubular body 2 having one end serving as a joint portion 21, and the tubular bodies 1 and 2 are disposed via an intermediate tubular body 3. This is a swivel pipe joint that is connected with the joint portions 15 and 21 facing outward. The tubular body 1 forms a hollow shaft portion 11 rotatably inserted into the intermediate tubular body 3 and a head portion 12 having an outer diameter larger than the hollow shaft portion. A stepped portion 16 is slidably contacted with one end edge of the intermediate cylindrical body 3 and an outer peripheral portion of the hollow shaft portion 11 is detachably engaged with another end edge of the intermediate cylindrical body 3. The member 4 protrudes. A male screw part 31 is formed on the outer peripheral part of the intermediate cylindrical body 3, and a female screw part 22 screwed with the male screw part 31 of the intermediate cylindrical body 3 is formed on the inner peripheral part of one end of the cylindrical body 2. You.
[Selection diagram] Fig. 1

Description

  The present invention relates to a rotary type pipe joint suitable for connecting a hose, that is, a flexible pipe, and more particularly to a swivel pipe joint having a simple structure which can be interposed in the middle of a hose to prevent twisting of the hose.

  There are many types of pipe joints depending on the connection method, shape, and material, and they are broadly classified into permanent joints that permanently fix pipes and pipes and detachable detachable joints. The permanent joint joins two pipes together by welding or the like, and is used when it is not necessary to remove the pipes or in a high-pressure pipe.

  On the other hand, a detachable joint is a joint that can join or separate two pipes, and examples thereof include a flange-type joint, an Inro joint, and a screwed joint.

  However, most of them involve processing the pipe ends to firmly connect the pipes to each other, so that the connected pipes cannot be rotated or turned. In addition, as the pipe joint that can rotate and pivot the connecting pipe, a rotating pipe joint (rotary joint) that incorporates a rolling bearing and performs continuous rotation at a constant speed, and a rotating and pivoting operation of the connecting pipe are required. There is a swivel joint (swivel joint) that can be performed according to the following.

  Among these, the swivel joint has a bend-shaped member having a hemispherical flare portion (ball) formed at one end, and a socket-shaped member for accommodating the flare portion. 2. Description of the Related Art There is known a structure in which nuts are connected via a sealing material that contacts a surface (for example, Patent Document 1).

  Further, a swivel pipe joint is known in which a plurality of annular bearing races are formed between a tubular male member and a female member into which one end is inserted, and a ball bearing is accommodated in each of the bearing races (for example, Patent Document 1). ).

Japanese Utility Model Publication No. 7-46859 (FIG. 4)

Japanese Patent Publication No. Hei 10-502156

  However, the conventional swivel fitting is difficult to manufacture, and the one disclosed in Patent Document 1 forms a hemispherical flared portion at one end of a constituent member and incorporates a spring to make the flared portion adhere to the sealing material. There is a need to. In addition, there is a disadvantage that when an external force in the axial direction is applied to keep the sealing material in close contact with the flare portion by the spring, the sealing performance is lost and the fluid leaks.

  Further, according to the swivel pipe joint disclosed in Patent Literature 2, although the male member and the female member can be smoothly rotated to connect the male member and the female member via the ball bearing, the male member and the female member can be rotated. The disadvantage is that both sides have to form a race with a semicircular cross section, or that a number of ball bearings have to be introduced into the race one by one.

  In addition, couplings are often used to connect hoses. In such couplings, steel balls are arranged in an annular shape inside the female member, and a sleeve that pushes each steel ball inward is slidable in the axial direction. On the other hand, since the male member is formed with an annular groove for receiving a steel ball, there is an advantage that the male member and the female member can be easily attached and detached by sliding the sleeve, but the structure is complicated and the cost increases. There was a disadvantage.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a swivel fitting which can be easily manufactured with a simple structure.

  In order to achieve the above object, the present invention has a first tubular body having one end serving as a first joint and a second tubular body having one end serving as a second joint. A swivel fitting in which the body and the second tubular body are connected via an intermediate tubular body with the first joint portion and the second joint portion facing outward, wherein the first tubular body is A hollow shaft portion rotatably inserted into the intermediate cylindrical body and a head portion having an outer diameter larger than the hollow shaft portion are formed, and a step portion between the head portion and the hollow shaft portion is the intermediate cylindrical body. A detachable locking member which is slidably contacted with one end edge of the hollow cylindrical portion and is slidably contacted with another end edge of the intermediate tubular body. .

  In the swivel pipe joint as described above, a male screw portion is formed on the outer peripheral portion of the intermediate cylindrical body, and an intermediate cylindrical portion is formed on the inner peripheral portion of one end of the second cylindrical body on the side opposite to the second joint portion. A female screw part to be screwed with the male screw part of the body is formed, and a lock member for preventing relative rotation between the second cylindrical body and the intermediate cylindrical body is provided on the second cylindrical body. A screw hole for screwing is formed.

  Further, it is preferable that the first joint portion is formed by cutting a male screw or a female screw at one end of the first cylindrical body, and the second joint portion is formed by cutting a male screw or a female screw at one end of the second cylindrical body. A seal ring is interposed between the intermediate cylindrical body and the first cylindrical body and between the intermediate cylindrical body and the second cylindrical body.

  According to the swivel fitting of the present invention, the first tubular body forms a hollow shaft portion rotatably inserted into the intermediate tubular body and a head portion having a larger outer diameter than the hollow shaft portion. A stepped portion between the head portion and the hollow shaft portion is slidably contacted with one end edge of the intermediate cylindrical body, and an outer peripheral portion of the hollow shaft portion is slidably contacted with another end edge of the intermediate cylindrical body. Is protruded, so that relative rotation between the first tubular body and the intermediate tubular body is possible, and since the locking member is detachable, assembly and disassembly can be easily performed. Further, since the first tubular body and the second tubular body are connected via the intermediate tubular body with the first joint portion and the second joint portion facing outward, nipples are attached to both joint portions. By connecting the hose through an intermediary or the like, even a long hose can be prevented from twisting, which impairs fluid flow, Twisting even when occurring first cylindrical member and the intermediate tubular body by relatively rotating the can be easily solved.

  Further, since the intermediate tubular body and the second tubular body are configured to be screwed together, they can be easily combined with each other in a simple coupling form, and the second tubular body has an intermediate tubular shape. Since the screw hole for screwing the lock member that prevents relative rotation with the body is formed, the second tubular body and the intermediate tubular body can be integrated to prevent the two from being carelessly separated. .

  In addition, the first cylindrical body and the second cylindrical body can be exchanged for one having a different form of the joint part by using the intermediate cylindrical body as a common part, and the exchange can correspond to connection of various pipes. Further, since a seal ring is interposed between the intermediate cylindrical body and the first cylindrical body and between the intermediate cylindrical body and the second cylindrical body, a high-pressure fluid having high sealing performance is provided. Leakage can also be prevented.

  Hereinafter, the swivel fitting of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a preferred embodiment of the swivel fitting. In FIG. 1, reference numeral 1 denotes a first tubular body, 2 denotes a second tubular body, and both tubular bodies 1 and 2 are connected in series via an intermediate tubular body 3.

  The cylindrical body 1 has a two-stage structure including a cylindrical hollow shaft portion 11 having an outer diameter slightly smaller than the inner diameter of the intermediate cylindrical body 3 and a hollow head portion 12 having an outer diameter larger than the hollow shaft portion. It is a male member having a structure, and the hollow shaft portion 11 is rotatably inserted into the intermediate cylindrical body 3.

  In particular, as is apparent from FIGS. 1 and 2, a narrow annular groove 13 is formed at one end side of the outer peripheral portion of the hollow shaft portion 11, and a wide annular groove is formed between the annular groove 13 and the head portion 12. Thus, two annular grooves 14 are formed. The locking member 4 is mounted in the narrow annular groove 13, and the seal ring 5 (O-ring) is fitted in the wide annular groove 14. One end of the cylindrical body 1 on the opposite side of the hollow shaft portion 11 is formed as a first joint portion 15 formed by cutting an internal thread of the head portion 12 with a predetermined pitch female screw. The pipe member can be screwed. The outer peripheral surface of the head portion 12 has a hexagonal shape so that it can be tightened with a tool such as a wrench when connecting the pipe member to the joint portion 15.

  On the other hand, as shown in FIG. 1 and FIG. 3, one end of the cylindrical body 2 is formed as a second joint portion 21 having an inner peripheral portion formed by cutting female threads at a predetermined pitch. The members can be screwed together. At the other end of the cylindrical body 2, a female screw part 22 different from the joint part 21 is formed, and the female screw part 22 enables coupling with the intermediate cylindrical body 3.

  That is, a male screw portion 31 that is screwed with the female screw portion 22 of the cylindrical body is formed on the outer peripheral portion of the intermediate cylindrical body 3, and the male screw portion 31 and the female screw portion 22 are screwed into a cylindrical shape. Both the body 2 and the intermediate tubular body 3 are connected. The cylindrical body 2 has a hexagonal outer peripheral surface over its entire length so that the connection can be made firmly by using a tool such as a spanner, and the male screw part 31 is also provided on the intermediate cylindrical body 3. A hexagonal flange 32 is formed on the outer peripheral portion at one end adjacent to.

  In particular, a screw hole 23 penetrating the inside and outside of the cylindrical body 2 at one end outer peripheral portion on the female screw portion 22 side is formed. By press-fitting to the outer peripheral portion of the body 3, the relative rotation between the screw-connected tubular body 2 and the intermediate tubular body 3 is prevented. For this reason, it is possible to prevent the female screw portion 22 and the male screw portion 31 from loosening during the flow of the fluid and the tubular body 2 from coming off the intermediate tubular body 3.

  As shown in FIGS. 1 and 4, an annular groove 33 is also formed at the outer peripheral portion of one end of the intermediate cylindrical body 3, and a seal ring 7 such as an O-ring made of a rubber-like elastic body is fitted into the annular groove 33. It is supposed to be. Incidentally, since the annular grooves 14 and 33 are for fitting the seal rings 5 and 7, processing accuracy is not required unlike the race for accommodating the ball bearing of Patent Document 2, and in addition, the annular grooves 14 and 33 are also cylindrical bodies. Since it is formed on the outer peripheral portion of the first and intermediate cylindrical bodies 3, the processing is easy.

  Next, FIG. 5 shows a state where the cylindrical bodies 1 to 3 are connected. As is clear from this figure, the hollow shaft portion 11 of the tubular body 1 is slightly longer than the intermediate tubular body 3, and a locking member 4 protruding from one end outer peripheral portion is provided at one end edge of the intermediate tubular body 3. The step portion 16 between the hollow shaft portion 11 and the head portion 12 comes into close contact with the other end edge of the intermediate cylindrical body 3 in a sliding contact state. For this reason, the movement of the cylindrical body 1 is restricted in the axial direction, and there is no play, and only the 360-degree rotation operation with respect to the intermediate cylindrical body 3 is allowed. In this embodiment, the locking member 4 is a C-shaped snap ring fitted in the annular groove 13. A metal ring is used for the locking member 4, which is screwed to the outer peripheral portion of the hollow shaft portion 11. And so on.

  As shown in FIG. 5, a seal ring 5 provided on the outer peripheral portion of the cylindrical body 1 is slidably adhered to the inner peripheral surface of the intermediate cylindrical body 3 so as to be slidable. The seal ring 7 provided on the outer peripheral portion of the intermediate cylindrical body 3 is slidably adhered to the inner peripheral surface of the cylindrical body 3 so as to slidably contact with the intermediate cylindrical body 3. A seal is provided between the body and the body 2, but the seal rings 5 and 7 may be omitted. That is, if the fluid to be circulated inside is at a low pressure, the locking member 4 is provided with a sealing property to prevent the fluid from leaking from between the tubular body 1 and the intermediate tubular body 3, The seal between the body 3 and the cylindrical body 2 can be secured to some extent by the close contact between the male screw portion 31 and the female screw portion 22.

  Here, the tubular bodies 1 and 2 are connected with the joints 15 and 21 facing outward to form a straight swivel pipe joint. As a pipe member, for example, a known hose nipple 8 as shown in FIG. 6 is connected, and a rubber hose 9 or the like is connected to the hose nipple 8.

  According to this, since such a swivel pipe joint is interposed in the middle of the hose 9, even with a long hose, the relative rotational motion between the tubular body 1 and the intermediate tubular body 3 (the tubular body 2) causes. Twist is prevented, and even when twisting occurs, twisting of the hose can be easily eliminated by rotating the tubular body 1 and the intermediate tubular body 3 (the tubular body 2) relatively. Therefore, the fluid can be smoothly circulated without damming.

  Although the preferred embodiment of the swivel pipe joint according to the present invention has been described above, the hose 9 is not connected to the joint portions 15 and 21 via the hose nipple 8 but is used as a use mode. A rigid rigid pipe can be directly connected. The joint portions 15 and 21 are formed by cutting female threads at one end of the tubular bodies 1 and 2 as in the above-described example, or may be formed into male screw types 15A and 21A as shown in FIG. . As shown in FIG. 8, one of the joints may be a female screw type 15 and the other joint may be a male screw type 21A. Further, it is also possible to adopt a method in which the joint is formed as an unthreaded cylinder and a hose is inserted into the outer peripheral portion thereof.

  In particular, by preparing several types of cylindrical bodies 1 and 2 having different outer diameters and inner diameters of the joint portion, and appropriately replacing the cylindrical bodies 1 and 2 with the intermediate cylindrical body 3 as a common part, it is possible to connect various pipes. Can respond.

Exploded perspective view showing the swivel fitting according to the present invention. Longitudinal sectional view of the first cylindrical body Longitudinal sectional view of the second cylindrical body Longitudinal sectional view of the intermediate cylindrical body Assembly drawing showing the internal structure of the swivel fitting according to the present invention Explanatory drawing showing a pipe member connected to a joint at both ends Explanatory drawing which shows the modification of the swivel pipe joint which concerns on this invention. Explanatory drawing which shows the modification of the swivel pipe joint which concerns on this invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 1st cylindrical body 11 hollow shaft part 12 head part 15 1st joint part 2 2nd cylindrical body 21 2nd joint part 22 female screw part 23 screw hole 3 intermediate cylindrical body 31 male screw part 5,7 seal ring (O-ring)
4 Locking member (snap ring)
6 Lock member

Claims (5)

  One end has a first cylindrical body having a first joint portion, and one end has a second cylindrical body having a second joint portion. The first cylindrical body and the second cylindrical body are intermediate cylinders. A swivel joint connected with the first joint portion and the second joint portion facing outward via a tubular member, wherein the first tubular member is rotatably inserted into an intermediate tubular member. Forming a hollow shaft portion to be inserted and a head portion having a larger outer diameter than the hollow shaft portion, and a step portion between the head portion and the hollow shaft portion is slidably contacted with one end edge of the intermediate cylindrical body, A swivel pipe joint, wherein a detachable locking member which slides on the other end of the intermediate cylindrical body is provided on an outer peripheral portion of the hollow shaft portion.   A male screw portion is formed on an outer peripheral portion of the intermediate cylindrical body, and a female screw is screwed into an inner peripheral portion of one end of the second cylindrical body on the opposite side of the second joint portion to the male screw portion of the intermediate cylindrical body. The swivel fitting according to claim 1, wherein the portion is formed.   The swivel tube according to claim 1 or 2, wherein the second cylindrical body has a screw hole for screwing a lock member that prevents relative rotation between the second cylindrical body and the intermediate cylindrical body. Fittings.   The first joint portion is formed by cutting a male screw or a female thread at one end of the first cylindrical body, and the second joint portion is formed by cutting a male screw or a female thread at one end of the second cylindrical body. The swivel fitting according to any one of claims 3 to 7. The seal ring according to any one of claims 1 to 4, wherein a seal ring is interposed between the intermediate cylindrical body and the first cylindrical body and between the intermediate cylindrical body and the second cylindrical body. Swivel fitting.

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